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basic_istream::putback 

Puts a specified character into the stream.


basic_istream& putback(
   char_type _Ch
);

Parameters

_Ch

A character to put back into the stream.

The stream (*this).

The unformatted input function puts back _Ch, if possible, as if by calling rdbuf->sputbackc. If rdbuf is a null pointer, or if the call to sputbackc returns traits_type::eof, the function calls setstate(badbit). In any case, it returns *this.

// basic_istream_putback.cpp
// compile with: /EHsc
#include <iostream>
using namespace std;

int main( ) 
{
   char c[10], c2, c3;

   c2 = cin.get( );
   c3 = cin.get( );
   cin.putback( c2 );
   cin.getline( &c[0], 9 );
   cout << c << endl;
}

Input

qw

Output

q

Header: <istream>

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